linux-kernel - Re: [PATCH] perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present

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Date:   Sun, 3 Sep 2023 20:36:35 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf cs-etm: Bump minimum OpenCSD version to ensure a
 bugfix is present

On Fri, Sep 1, 2023 at 6:37 AM James Clark <james.clark@....com> wrote:
>
> Since commit d927ef5004ef ("perf cs-etm: Add exception level consistency
> check"), the exception that was added to Perf will be triggered unless
> the following bugfix from OpenCSD is present:
>
>  - _Version 1.2.1_:
>   - __Bugfix__:
>     ETM4x / ETE - output of context elements to client can in some
>     circumstances be delayed until after subsequent atoms have been
>     processed leading to incorrect memory decode access via the client
>     callbacks. Fixed to flush context elements immediately they are
>     committed.
>
> Rather than remove the assert and silently fail, just increase the
> minimum version requirement to avoid hard to debug issues and
> regressions.
>
> Signed-off-by: James Clark <james.clark@....com>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/build/feature/test-libopencsd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/build/feature/test-libopencsd.c b/tools/build/feature/test-libopencsd.c
> index eb6303ff446e..4cfcef9da3e4 100644
> --- a/tools/build/feature/test-libopencsd.c
> +++ b/tools/build/feature/test-libopencsd.c
> @@ -4,9 +4,9 @@
>  /*
>   * Check OpenCSD library version is sufficient to provide required features
>   */
> -#define OCSD_MIN_VER ((1 << 16) | (1 << 8) | (1))
> +#define OCSD_MIN_VER ((1 << 16) | (2 << 8) | (1))
>  #if !defined(OCSD_VER_NUM) || (OCSD_VER_NUM < OCSD_MIN_VER)
> -#error "OpenCSD >= 1.1.1 is required"
> +#error "OpenCSD >= 1.2.1 is required"
>  #endif
>
>  int main(void)
> --
> 2.34.1
>